记住页面阅读进度，即使对于单页面，也能很好的工作！
当前为
// ==UserScript==
// @name 记住阅读进度
// @namespace http://tampermonkey.net/
// @version 2.6.0
// @description 记住页面阅读进度，即使对于单页面，也能很好的工作！
// @match *://*/*
// @exclude http://127.0.0.1*
// @exclude http://localhost*
// @author zhuangjie
// @icon data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Your code here...
// 解决广工商学校选课网无法显示左边栏：原因是脚本中加了 window.onload 有关
// 获取滚动历史高度
let item_content = localStorage.getItem(getCurrentUrl())
let history_high = item_content == null?0:parseFloat(item_content);
// 初始化程序
do {
if(history_high <= getDocumentHeight() || document.readyState == "complete") {
init();
break;
}
}while(history_high <= getDocumentHeight() || document.readyState == "complete");
//有动画地滚动
let st = null; //保证多次执行 ScrollTo 函数不会相互影响
function ScrollTo(scroll, top) {
if(st != null ) {
//关闭上一次未执行完成的滚动
clearInterval(st);
}
//每次移动的跨度
let span = 5;
st = setInterval(function () {
let currentTop = getCurrentTop();
//当在跨度内时，直接到达
if (currentTop >= top - span && currentTop <= top + span) {
setTop(top);
// $(scroll).scrollTop(top);
//让st为null，让关闭定时器
let tmp_st = st;
st = null;
//关闭定时器（下一次不会再执行，但本次还会执行下去），再return;
clearInterval(tmp_st);
// console.log("滚动完成",top+"<is>"+ getCurrentTop() )
return;
}
//如果不在跨度内时，根据当前的位置与目的位置进行上下移动指定跨度
if (currentTop < top) {
setTop(currentTop + span)
} else {
setTop(currentTop - span)
}
span++
}, 20)
}
function onUrlChange(fun) {
let initUrl = window.location.href.split("#")[0];
setInterval(function () {
let currentUrl = window.location.href.split("#")[0];
if(initUrl != currentUrl) {
// console.log("url改变了")
fun();
initUrl = currentUrl;
}
},460)
}
// 获取url，url经过了处理
function getCurrentUrl() {
return window.location.href.split("#")[0]
}
function getCurrentPageWhoRoll() {
return getCurrentUrl()+"<and>WhoRoll";
}
function getCurrentTop() {
return document.documentElement.scrollTop || document.body.scrollTop;
}
// 获取文档高度
function getDocumentHeight() {
// 获取最大高度
return (document.documentElement.scrollHeight > document.body.scrollHeight?document.documentElement.scrollHeight:document.body.scrollHeight)
}
function setTop(h) {
let whoRoll = localStorage.getItem(getCurrentPageWhoRoll())
if(whoRoll == "document") {
if(document.documentElement.scrollHeight >= h ) {
document.documentElement.scrollTop = h;
}
}else {
if(document.body.scrollHeight >= h ) {
document.body.scrollTop = h;
}
}
}
// 主程序
function init() {
// 位置还原
function recover() {
// setTop(0)
setTimeout(function() {
let item_content = localStorage.getItem(getCurrentUrl())
if (item_content == null) return;
// 有滚动记录
let history_high = parseFloat(item_content);
let current_height = getDocumentHeight();
if(history_high != null && history_high >= 10 ) {
let nearby = parseInt(""+(history_high-80))
setTop(nearby);
let t = setInterval(function() {
// console.log(Math.abs((""+parseInt(getCurrentTop())) - nearby) < 10)
if(Math.abs((""+parseInt(getCurrentTop())) - nearby) < 10) {
ScrollTo(document,history_high)
clearInterval(t);
}
},200)
}
},800)
}
recover();
onUrlChange(recover)
// 位置保存
function debounce(fn, wait) {
var timeout = null;
return function() {
console.log("滚动了")
if(timeout != null ) clearTimeout(timeout);
timeout= setTimeout (fn, wait);
}
}
// 处理函数
function handle() {
console.log(document.documentElement.scrollTop , document.body.scrollTop )
let current_top = getCurrentTop();
let current_url = getCurrentUrl()
if(document.documentElement.scrollTop > document.body.scrollTop ) {
localStorage.setItem(getCurrentPageWhoRoll(),"document")
}else {
localStorage.setItem(getCurrentPageWhoRoll(),"body")
}
console.log("保存位置：",current_url,current_top);
console.log("滚动责任：",localStorage.getItem(getCurrentPageWhoRoll()));
if(current_top <= 10) return;
localStorage.setItem(current_url,""+current_top)
}
// 滚动事件
window.addEventListener('scroll', debounce(handle, 460));
}
})();